91276c0fa4
BAST is the one machine that theoretically supports unmodified ISA drivers for hardware on its PC/104 connector, using a custom version of the inb()/outb() and inw()/outw() macros. This is incompatible with the generic version used in asm/io.h, and can't easily be used in a multiplatform kernel. Removing the special case for 16-bit I/O port access on BAST gets us closer to multiplatform, at the expense of any PC/104 users with 16-bit cards having to either use an older kernel or modify their ISA drivers to manually ioremap() the area and use readw()/write() in place of inw()/outw(). Either way is probably ok, given that there is a recurring discussion about dropping s3c24xx altogether, and many traditional ISA drivers are already gone. Machines other than BAST already have no support for ISA drivers, though a couple of them do map one of the external chip-selects into the ISA port range, using the same address for 8-bit and 16-bit I/O. It is unlikely that anything actually uses this mapping, but it's also easy to keep this working by mapping it to the normal platform-independent PCI I/O base that is otherwise unused on s3c24xx. The mach/map-base.h file is no longer referenced in global headers and can be moved into the platform directory. Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
32 lines
704 B
C
32 lines
704 B
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (c) 2009-2011 Samsung Electronics Co., Ltd.
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// http://www.samsung.com
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//
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// Samsung CPU Support
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include "map-base.h"
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#include "cpu.h"
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unsigned long samsung_cpu_id;
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void __init s3c64xx_init_cpu(void)
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{
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samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0x118);
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if (!samsung_cpu_id) {
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/*
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* S3C6400 has the ID register in a different place,
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* and needs a write before it can be read.
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*/
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writel_relaxed(0x0, S3C_VA_SYS + 0xA1C);
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samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0xA1C);
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}
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pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
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}
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